package chap01;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;

public class Demo3 {
    public static void main(String[] args) {
        ExecutorService executorService = Executors.newSingleThreadExecutor();
        ExecutorService executorService1 = Executors.newCachedThreadPool();
        ScheduledExecutorService timer = Executors.newSingleThreadScheduledExecutor();
    }
}

